Type-writing or printing machine



No. 608,440. Patented Aug. 2, I898.

0'. E. convansz. TYPE WRITING 0B PRINTINGMACHINE.

(Application filed June 12, 1897. (No Model.)

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- UNITED STATES PATENT OFFICE.

OLIVER E. CONVERSE, OF ST. LOUIS, MISSOURI.

TYPE-WRITING OR PRINTING MACHINE.

SPECIFICATION forming part of Letters Patent No. 608,440, dated August 2, 1898.

Application filed June 12, 1897. Serial No. 640,498. (No model.)

To all whom it may concern.-

Be it known that I, OLIVER E. CONVERSE, a citizen of the United States, residing. at St. Louis, in the Stateof Missouri, have invented certain new and useful Improvements in Type-\Vriting or Printing Machines; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the figures of reference marked thereon, which form a part of this specification.

The object of this invention is to provide improved means for mounting and operating a type-writing platen in order that in the rotation of said platen successive longitudinal lines on the surface of the platen will be brought into position to be engaged by the type-faces and in the further and continued rotation of the platen said lines will overlap upon each other and insure the use and em ployment of the entire surface of the platen.

My invention consists in the construction, arrangement, and combination of elements hereinafter set forth, pointed out in my claims, and illustrated by the accompanying drawings, in which- Figure 1 is an end elevation of a platen and its shaft, illustrating the means whereby it is rotated, the space-lever employed in rotating the same not being illustrated, as it may be of any common and well-known form. Fig. 2 is an elevation, partly in section, on the indicated line 2 2 of Fig. 1.

In the construction of the device as illustrated in the drawings the numeral 10 designates a platen or roll mounted rigidly and concentrically upon a shaft 11,which shaft in turn is mounted for rotation in journal-bearings formed in a carriage-frame in an ordinary manner. A series of pins 15 are mounted rigidlyin the carriage-frame and have mounted for revolution thereon a series of disk rollers 16, preferably three in number. The disk rollers 16 engage in a groove formed in the periphery of an annular internallytoothed gear-wheel 17 and thus support said gear-wheel for rotation. The gear-wheel 17 is of substantially the same diameter as the platen and is mounted eccentrically of the axis of the shaft 11 and platen, and the internal teeth thereon engage with the externally-toothed pinion 18, mounted rigidly and I concentricallyof the shaft 11. The internal gear has a greater number of teeth than the external pinion and intermeshes therewith.

In practical operation the gear-Wheel 17 is rotated by engagement of a space-lever of any desired form with a ratchet 19, formed on said wheel, and the internal gear-teeth thereof engage the teeth of the pinion 18 and rotate said pinion, the shaft 11, and platen 10 conjunctively. By reason of the difference in diameter of the gear 17 and-pinion 18 as related to the diameter of the platen the surface or rim travel of the platen is more rapid than the rim travel of the gear 17, and because of the difference in number of the teeth on the pinion 18 and the ratchet-teeth on the rim 19 the platen is stopped and held temporarily at different successive points than would be the case if the ratchet-rim were mounted rigidly on the shaft 11 .or pinion 18. Hence in the rotation of the gear 17 successive longitudinal lines on the platen are brought into position to be engaged by the type-faces, and in the further and continued rotation of the platen said lines are overlapped upon each other, thus insuring the use and employment of the entire surface of the platen.

I claim as my invention- 1. In a type-writer or printing-machine, a

shaft, a platen rigidly and concentrically mounted on said shaft, a pinion rigidly and I concentrically mounted on said shaft, an in= ers, and a pinion mounted on the said shaft,

the gear-wheel being eccentric to the pinion and meshing therewith, and means for oper ating said annular internal gear.

In testimony whereof I affix my signature in presence of two witnesses.

OLIVER E. CONVERSE.

Vitnesses IGNATIA Wmennrrn, ANNA SOHOEPF. 

